參數(shù)資料
型號(hào)： UPD75P3018AGK-9EU
廠商： NEC Corp.
元件分類(lèi)： 圓形連接器
英文描述： Circular Connector; No. of Contacts:56; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:25-4 RoHS Compliant: No
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 24/64頁(yè)
文件大小： 356K
代理商： UPD75P3018AGK-9EU
PD75P3018A
30
Data Sheet U11917EJ2V0DS00
8. ONE-TIME PROM (PROGRAM MEMORY) WRITE AND VERIFY
The program memory contained in the
PD75P3018A is a 32768 × 8-bit one-time PROM that can be electrically written
one time only. The pins listed in the table below are used for this one-time PROM’s write/verify operations. Clock input
from the X1 pin is used instead of address input as a method for updating addresses.
Pin
Function
VPP
Pin where program voltage is applied during program memory
write/verify (usually VDD potential)
X1, X2
Clock input pins for address updating during program memory
write/verify. Input the X1 pin’s inverted signal to the
X2 pin.
MD0-MD3
Operation mode selection pin for program memory write/verify
D0/P40 to D3/P43
8-bit data I/O pins for program memory write/verify
(low-order 4 bits)
D4/P50 to D7/P53
(high-order 4 bits)
VDD
Pin where power supply voltage is applied.
Applies VDD = 1.8 to 5.5 V in normal operation mode and +6 V
for program memory write/verify.
Caution
Pins not used for program memory write/verify should be connected to VSS via a resistor individually.
8.1 Operation Modes for Program Memory Write/Verify
When +6 V is applied to the VDD pin and +12.5 V to the VPP pin, the
PD75P3018A enters the program memory write/verify
mode. The following operation modes can be specified by setting pins MD0 to MD3 as shown below.
Operation Mode Specification
Operation Mode
VPP
VDD
MD0
MD1
MD2
MD3
+12.5 V
+6 V
H
L
H
L
Zero-clear program memory address
L
H
Write mode
L
H
Verify mode
H
X
H
Program inhibit mode
X: L or H
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